// Copyright 2019 The Vearch Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.

package errutil

import (
	"io"
)

// ErrorFormat error print format definition
type ErrorFormat func([]error, io.Writer)

var (
	multilinePrefix    = []byte("the following errors occurred:")
	multilineSeparator = []byte("\n -- ")
)

// MultilineFormat error print format
func MultilineFormat(errs []error, w io.Writer) {
	w.Write(multilinePrefix)
	for _, err := range errs {
		w.Write(multilineSeparator)
		io.WriteString(w, err.Error())
	}
}
